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Hi. Using the technique I mentioned earlier, I was able to successfully weld a broken cast iron C-clamp. I used a small oxy propane torch and cast iron welding flux. The weld had no porosity. Oxy propane has a porosity problem with steel welding due to the heat being in the wrong part of the flame. But, there was a problem. EBay had 3/8" cast iron welding rod, but I was afraid it was too thick. That turned out to be correct. I found a cracked piece of cast iron pipe and hacksaw a 3/8 x1/4" rod from it. I couldn't get enough heat, so I ended up cutting it in half lengthwise and welding the two pieces together. This took a long time, but it worked great. I found out that piston rings aren't cheap! Hopefully I'll find some at a garage sale.